Writing the PhD thesis is so time-consuming work. Yes, definitely, it is too hard work for me. It is significantly different from master thesis. At that time, I had no idea about what I was writing and also it was written on Korean.
During a whole day, just sit and type something. However, the next day, the almost everything, which was done the day before, must be modified or be deleted. Sometime, I find the misunderstanding of my old calculation, then go back there and do the same thing as before.
However, I realize one important thing this: To write something is to find out what I did not understand and to engrave the specific knowledges on my stupid memory.